Unable to deactivate my Trados licence

I cannot deactivate my Trados licence.  I am using Trados 2019. I get the following error message:
There are multiple instances of this application running. Close the other instances before deactivating the licence.
I have checked the task manager and there is only over version of the app running, so I restarted my laptop but I still get the error message.
Any ideas?

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